CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Preferred Stock [Member] Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total	Series A Convertible Preferred Stock [Member]
Balance at Dec. 31, 2021	$ 1	$ 13	$ 166,191	$ (140,702)	$ 25,503
Balance (in shares) at Dec. 31, 2021	156	2,601
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with private offering	$ 0	$ 1	(1)	0	0
Issuance of common stock in connection with private offering (in shares)	0	275
Issuance of common stock from vested restricted stock units	$ 0	$ 0	(5)	0	(5)
Issuance of common stock from vested restricted stock units (in shares)	0	2
Issuance of common stock and warrants in connection with November 2022 private offering, net.	$ 0	$ 12	7,383	0	7,395
Issuance of common stock and warrants in connection with November 2022 private offering, net. (in shares)	0	2,185
Forfeiture of unvested restricted stock	$ 0	$ 0	0	0	0
Forfeiture of unvested restricted stock (in shares)	0	(4)
Cash dividends to Series A convertible preferred stockholders	$ 0	$ 0	0	(16)	(16)	$ (16)
Cash dividends to Series A convertible preferred stockholders (in shares)	0	0
Stock-based compensation	$ 0	$ 0	2,935	0	2,935
Net loss	0	0	0	(24,579)	(24,579)
Balance at Dec. 31, 2022	$ 1	$ 26	177,377	(165,297)	12,107
Balance (in shares) at Dec. 31, 2022	156	5,127
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with Exacis asset acquisition	$ 0	$ 0	208	0	208
Issuance of common stock in connection with Exacis asset acquisition (in shares)	0	69
Issuance of common stock related to stock purchase agreement with Lincoln Park Capital Fund, LLC, net	$ 0	$ 1	579	0	580
Issuance of common stock related to stock purchase agreement with Lincoln Park Capital Fund, LLC, net (in shares)	0	214
Issuance of note warrants	$ 0	$ 0	9,014	0	9,014
Repricing of warrants in connection with December 2023 financing	0	0	766	0	766
Cash dividends to Series A convertible preferred stockholders	$ 0	$ 0	0	(16)	(16)	$ (16)
Cash dividends to Series A convertible preferred stockholders (in shares)	0	0
Stock-based compensation	$ 0	$ 0	1,242	0	1,242
Net loss	0	0	0	(21,668)	(21,668)
Balance at Dec. 31, 2023	$ 1	$ 27	$ 189,186	$ (186,981)	$ 2,233
Balance (in shares) at Dec. 31, 2023	156	5,410